This document discusses the history and evolution of hip-hop music from its origins in Africa through its development in the United States. It covers early influential artists like the Sugarhill Gang and Grandmaster Flash, the rise of gangster rap groups like N.W.A., and the career of Tupac Shakur. It also examines the shift from early hip-hop that told stories to the more commercial gangster rap that was criticized for vulgar lyrics, and the subsequent growth of conscious rap artists with positive political and social messages.